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NEC 2014 — Enphase System Code Compliance <br />© 2015 Enphase Energy Inc. All rights reserved. January 20154 <br />Three-Phase 208/120 Volt Services <br />Solution: The compliance solution for systems interconnected to three-phase systems is to defer to NEC <br />90.4. There are no three-phase AC AFCI detection devices in existence. Until backfeed capable three- <br />phase AC AFCI circuit breakers become generally available, an AHJ is permitted to refer to 90.4, i.e., the <br />previous code edition, NEC 2011. Additionally, the NEC 210.12 code intention for any AC AFCI protection <br />is for single-phase applications in dwellings or dormitory units and not meant for three-phase applications, <br />example: <br />Code Reference <br />210.12 Arc-Fault Circuit-Interrupter Protection. … <br />210.12(A) Dwelling Units. All 120-volt, single-phase, 15- and 20-ampere branch circuits….. <br />210.12(B) Branch Circuit Extensions or Modifications — Dwelling Units. … <br />210.12(C) Dormitory Units. All 120-volt, single-phase, 15- and 20-ampere branch circuits <br />Although Chapter 7 applies to “Special Conditions,” the industry must be able to supply generally <br />available equipment that is safe to use and meets the requirements for these special applications. For <br />705.12(D) (6) this is not the case for three-phase applications as there are no listed three-phase AC AFCI <br />detection devices available. <br />NEC 2014 Section 690.11 DC Arc-Fault Circuit Protection <br />This requirement is for direct current (DC) Arc-Fault Circuit protection and only applies to systems with <br />DC voltages above 80 VDC. Enphase Microinverter systems are exempted from this requirement as they <br />always operate well below 80 VDC. The requirement is basically unchanged from the NEC 2011, and it is <br />unnecessary to add DC AFCI to an Enphase Microinverter System installation. <br />Code Reference <br />690.11 Arc-Fault Circuit Protection (Direct Current). Photovoltaic systems with dc source <br />circuits, dc output circuits, or both, operating at a PV system maximum system voltage of 80 volts <br />or greater, shall be protected by a listed (dc) arc-fault circuit interrupter, PV type, or other system <br />components listed to provide equivalent protection. <br />1338 N Custer St <br />05/01/23